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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 1.5L (LYX)) >> Diagnostic Information And Procedures >> Upper Engine Noise, Regardless Of Engine Speed

Upper Engine Noise, Regardless Of Engine Speed

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Cause Correction
Low oil pressure
Worn valve rocker arm Replace the valve rocker arm.
Improper lubrication to the valve rocker arms Inspect the following components and repair or replace as required:
  • The valve rocker arm
  • The valve lifter
  • The oil filter bypass valve
  • The oil pump and pump screen
  • The engine block oil galleries
Broken valve spring Replace the valve spring.
Worn or dirty valve lifters Replace the valve lifters.
Stretched timing chain and/or damaged sprocket teeth Replace the timing chain and sprockets.
Worn, damaged, or faulty timing chain tensioner Replace the tensioner.
Worn engine camshaft lobes
  • Inspect the engine camshaft lobes.
  • Replace the camshaft and valve lifters as required.
Worn valve guides or valve stems Inspect the following components, and repair as required:
  • The valves
  • The valve guides
Stuck valves
Carbon on the valve stem or valve seat may cause the valve to stay open.		 Inspect the following components and repair as required:
  • The valves
  • The valve guides
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